Main features of Thermal Mass Flow Meter1&period;It can conveniently and accurately measure gas-flow rate without temperature and pressure compensation&comma; from which users can get gas mass flow or standard volume flow&period;2&period;Large ratio of measuring range&period; It can measure gas with velocity of flow from 100Nm&sol;s to 0&period;5Nm&sol;s&comma; and be used in gas leak hunting&period;3&period;Good anti-seismic performance and long useful life&period; The converter doesn't contain movable part and pressure sense part&comma; so that the measuring accuracy will not be influenced by shaking&period;4&period;Easy installation and maintenance&period; If possible&comma; on line installations and maintenance are allowed&period; &lpar;See Safety Notice&rpar;5&period;Digital design&period; The meter utilizes digital circuit measurement to assure accurate result and convenient maintenance&period;6&period;Factory automation and integration can be achieved by using RS-485 or HART communication&period;